Malicious PDF — malware analysis report

Static analysis result for SHA-256 d381800f3cb47c76…

MALICIOUS

PDF

88.6 KB Created: 2021-09-15 06:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4797b40237cd44b4747582785663cfe5 SHA-1: c17e0c3c55c46851521d6d86d965e00505739cd3 SHA-256: d381800f3cb47c76e94dc0cfd0b6f80c2f6badf9179efdea0bf2a82d42dc477a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a QR code lure further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://matraholding.hu/images/userfiles/files/vilupepe.pdf In PDF document text
    • http://hwayinn.com/image/files/20210907_071405.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210914092517.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/8207003532.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/80368990254.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614137c201c08---83092390745.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/86872558671.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/zofom.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/vedukil.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414192ba73e---zobidobobos.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/8333480315.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d37ebea99---94359453871.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kjtrel1ermtrk5nebm2bb50t27/28277878061.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6b7ec39---berif.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/45623100633.pdfIn PDF document text
    • http://banquat.com/userfiles/files/62729369786.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/muwosurugujuxuxepumikadod.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/77790522171.pdfIn PDF document text
    • http://immopolignano.lu/images/33228568738.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i0udb5i22qmm2kcd5ienjl80hc/wilidetat.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/70247911913.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210901105902352.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/zomujaxunivaxo.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/nazaxiwibobisukeb.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/kavabojawomeguvevorowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+send+a+group+text+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 10800 bytes
SHA-256: f150caa29842acbc8cbca04559e82e4421a1e776a511cdcd6e303c22e53cc324
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 18964 bytes
SHA-256: 85e59722004a98fb8581961a5e34937018bdcd374c7a0e73eb55d6fa635fdce2

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